Installation Manual

TECHNICAL NOTE 4
Low temperature operation
Introduction
Radascan is a precision electro-mechanical device with hardware components that, of
necessity, are mounted in an external position on a vessel’s superstructure. It is recognized
that industrial marine operations may subject these components to harsh environments,
including low temperature.
The standard variant of Radascan is designed to operate within the temperature range -25
to 55ºC. A low temperature variant of the hardware complies with the requirements of
IEC60068-2-1 and is able to operate for prolonged periods at temperatures down to -25ºC
provided that certain operating conditions are maintained.
Operating conditions
The following recommendations are made for low temperature use:
• For operation below 5ºC the sensor should remain powered and running (i.e. not
suspended). However, where this is not possible and it is necessary for the system to be
switched on at temperatures below 5ºC (and down to -25ºC) the sensor will require
some time to reach optimum operating condition.
• When the system is not in use (i.e. un-powered or suspended) the sensor should be
protected by means of a suitable insulating and protective cover to prevent the external
build-up of ice.
• For operation below -25ºC additional forced air heating must be provided.
• The external PSU leads are rated for static operation to -40ºC but only to -5ºC for flexing
operation. The leads must therefore be adequately secured to prevent flexing and the
system should not be installed or de-installed at temperatures below 0ºC.
Technical considerations
• Radascan uses a sophisticated rotating microwave radar range-finder to accurately
measure the distance and bearing to retro-reflective targets that are placed at specific
locations in the working area. Movement sensors allow a mechanically driven base to
compensate for vessel motion due to wave action. The internal mechanism may become
disabled if it is allowed to cool in a low temperature environment.
Radascan
Installer – 25